@Article{BertaniRossHayaCohe:2015:UnAmFl,
               author = "Bertani, Thiago de Castilho and Rossetti, Dilce de F{\'a}tima and 
                         Hayakawa, Eriscon H. and Cohen, Marcelo C. L.",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Universidade Estadual 
                         do Oeste do Paran{\'a}} and {Universidade Federal do Par{\'a} 
                         (UFPA)}",
                title = "Understanding Amazonian fluvial rias based on a Late 
                         Pleistocene–Holocene analog",
              journal = "Earth Surface Processes and Landforms",
                 year = "2015",
               volume = "40",
               number = "3",
                pages = "285--292",
                month = "Mar.",
             keywords = "Amazonia,Madeira River,fluvial ria,Late 
                         Pleistocene–Holocene,neotectonics.",
             abstract = "Fluvial rias are elongated lakes at tributary mouths that can 
                         reach dozens of kilometers in length, constituting one of the most 
                         remarkable features in the Amazonian landscape. Thus far, 
                         definitive data which documents the genesis of fluvial rias have 
                         not been published. The main goal of this work was to integrate 
                         morphological, sedimentological and chronological information in 
                         order to characterize fluvial paleorias in the interfluve of the 
                         Purus and Madeira Rivers and discuss the most likely hypothesis 
                         for their genesis. These paleorias were first observed through 
                         remote sensing imagery as several elongated and interconnecting 
                         belts of open vegetation that are in sharp contact with the 
                         surrounding dense forest. The belts are branched and form a 
                         dendritic pattern similar to many modern drainage networks. The 
                         sedimentary record of these belts revealed the prevalence of 
                         sharp-based sandstones and mudstones arranged into fining-upward 
                         successions, which are compatible with deposition within channels. 
                         Active channel and abandoned channel deposits were recognized. 
                         These are topped by continuous mudstones related to rapid channel 
                         abandonment and formation of a low energy basin or ria 
                         environment. Radiocarbon dating of these deposits recorded only 
                         Late Pleistocene and Holocene ages ranging from 21 54722 
                         285\ cal\ yr\ bp to 
                         59286124\ cal\ yr\ bp. This chronology for 
                         sediment deposition is not compatible with the hypothesis of 
                         Amazonian rias being formed by fluvial erosion during the Last 
                         Glaciation Maximum low sea level, with sediment accumulation 
                         during the subsequent Holocene transgression. Instead, the studied 
                         paleorias record previous tributaries of the Madeira River that 
                         became abandoned as the position of this river shifted 
                         southeastward and its interfluve tilted northward, inverting the 
                         drainage systems. Therefore, a neotectonic origin of some 
                         Amazonian paleorias seems most likely. This hypothesis should be 
                         considered in further investigations aiming at understanding the 
                         origin of numerous modern fluvial rias that typify the Amazonian 
                         landscape.",
                  doi = "10.1002/esp.3629",
                  url = "http://dx.doi.org/10.1002/esp.3629",
                 issn = "0197-9337",
             language = "en",
           targetfile = "bertani_understanding.pdf",
        urlaccessdate = "27 abr. 2024"
}